ANSWER:

This is satan messing up with your head to make you fall into sin. 

Pray for him and his new bride and for their happiness. 

Ignore these whispers and move on.

Occupy yourself with constructive things and halal hobbies during free time, besides learning about your religion and trying to be a better Muslimah.

QUESTION: I liked my cousin but I never told it to anyone, recently he got engaged to someone else and now I cant get rid of thinking about him. I prayed, I do adhkar, I read Quran daily but i dont know why this is happening to me as I cant forget him. Please show me the straight path